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algorithm/isNumber/src/IsNumber.java at master · wodgithub/algorithm · GitHub
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src
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IsNumber.java
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59 lines (53 loc) · 1.74 KB
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isNumber
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src
/
IsNumber.java
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public
class
IsNumber
{
public
static
void
main
(
String
[]
args
){
String
s1
=
"abc"
;
String
s2
=
"-1.2"
;
String
s3
=
"1e-2"
;
String
s4
=
"0+01"
;
String
s5
=
" 1.2 "
;
System
.
out
.
println
(
s1
+
" "
+
isNumber
(
s1
));
System
.
out
.
println
(
s2
+
" "
+
isNumber
(
s2
));
System
.
out
.
println
(
s3
+
" "
+
isNumber
(
s3
));
System
.
out
.
println
(
s4
+
" "
+
isNumber
(
s4
));
System
.
out
.
println
(
s5
+
" "
+
isNumber
(
s5
));
}
public
static
boolean
isNumber
(
String
s
){
boolean
num
=
false
;
boolean
exp
=
false
;
boolean
dot
=
false
;
boolean
space
=
false
;
int
N
=
s
.
length
();
int
i
=
0
;
while
(
i
<
N
){
if
(
s
.
charAt
(
i
) ==
' '
)
space
=
true
;
else
if
(
space
)
return
false
;
// no space for a number
else
if
(
s
.
charAt
(
i
) ==
'-'
||
s
.
charAt
(
i
) ==
'+'
){
// +/- should be after e
if
(
i
>
0
)
if
(
s
.
charAt
(
i
-
1
) !=
'e'
&&
s
.
charAt
(
i
-
1
) !=
'E'
)
return
false
;
// i == 0 true if num == true
}
else
if
(
s
.
charAt
(
i
) >=
'0'
&&
s
.
charAt
(
i
) <=
'9'
)
num
=
true
;
else
if
(
s
.
charAt
(
i
) ==
'e'
||
s
.
charAt
(
i
) ==
'E'
){
// only one e, at least one num in the front
if
(
exp
|| !
num
)
return
false
;
exp
=
true
;
}
else
if
(
s
.
charAt
(
i
) ==
'.'
){
// no e if dot, only one dot
if
(
exp
||
dot
)
return
false
;
dot
=
true
;
}
else
return
false
;
i
++;
}
return
num
;
}
}
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